ways to catch bad records and ON ERROR destination

I'm trying to load 97m rows by converting a data type of a column which is supposed to be a numeric (BIGINT) field but currently stored as varchar(11). During the load process, due to 1 or 2 bad data rows, the whole process fails. I've been trying to extract the bad records(s) using ON ERROR destination, but something's not working.

Source table:

ID bigint,

PurchaseAmount varchar(11)

Destination table:

ID bigint,

PurchaseAmount bigint

ONERROR table

ID bigint,

PurchaseAmount varchar(11)

Select query

Select ID, Cast(PurchaseAmount as bigint) as PurchaseAmount from SourceTable              

 Is there any other way I can fix the issue. I've tried using ON Error on both source and destination. But doesn't seem to work.

Any help will be appreciated!!!